Mathematics, 31.03.2020 03:41, bricakes3
1. Industrial lightbulbs should have a mean life length acceptable to potential users and a relatively small variation in life length. Large variations below the mean annoy customers; large variations above the mean reduce replacement sales. A random sample of 20 bulbs produced by a particular manufacturer produced the following lengths of life in hours: 2100, 2302, 1951, 2067, 2415, 1883, 2101, 2046, 2378, 2019, 1924, 2183, 1977, 2492, 2286, 2401, 2046, 2161, 2253, 1827. a) Calculate the mean, variance and standard deviation of the life length using the standard unbiased estimator. b) Calculate the 95% confidence interval for the mean and the variance estimates.
Answers: 2
Mathematics, 21.06.2019 19:50, nawafcanada
On a piece of paper graft y+2> -3x-3 then determine which answer matches the graph you drew
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Mathematics, 21.06.2019 20:00, gracieorman4
Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11
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